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A new layered iron arsenide oxide (Fe2As2)(Ca4(Mg,Ti)3Oy) was discovered. Itscrystal structure is tetragonal with a space group of I4/mmm consisted of theanti-fluorite type FeAs layer and blocking layer of triple perovskite cells andis identical with (Fe2As2)(Sr4(Sc,Ti)3O8) discovered in our previous study. Thelattice constants of (Fe2As2)(Ca4(Mg,Ti)3Oy) are a = 3.877 A and c = 33.37 A.This compound exhibited bulk superconductivity up to 43 K in susceptibilitymeasurement without intentional carrier doping. A resistivity drop was observedat ~47 K and zero resistance was achieved at 42 K. These values correspond tothe second highest Tc among the layered iron-based superconductors afterREFeAsO system.

Superconductivity Above 40 K Observed in a New Iron Arsenide Oxide (Fe2As2)(Ca4(Mg,Ti)3Oy)